Answer
$40 feet$
Work Step by Step
$h=4+60t-16t^{2}$
To find the height after 3 seconds, t=3.
$h=4+60\times3-16\times3^{2}$ feet
$h=4+180-16\times9$ feet
$h=184-144$ feet
$h=40$ feet
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.1 - Algebraic Expressions, Real Numbers, and Interval Notation - Exercise Set - Page 14: 98
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